1 #include <linux/ceph/ceph_debug.h> 2 3 #include <linux/module.h> 4 #include <linux/fs.h> 5 #include <linux/slab.h> 6 #include <linux/string.h> 7 #include <linux/uaccess.h> 8 #include <linux/kernel.h> 9 #include <linux/namei.h> 10 #include <linux/writeback.h> 11 #include <linux/vmalloc.h> 12 #include <linux/posix_acl.h> 13 #include <linux/random.h> 14 15 #include "super.h" 16 #include "mds_client.h" 17 #include "cache.h" 18 #include <linux/ceph/decode.h> 19 20 /* 21 * Ceph inode operations 22 * 23 * Implement basic inode helpers (get, alloc) and inode ops (getattr, 24 * setattr, etc.), xattr helpers, and helpers for assimilating 25 * metadata returned by the MDS into our cache. 26 * 27 * Also define helpers for doing asynchronous writeback, invalidation, 28 * and truncation for the benefit of those who can't afford to block 29 * (typically because they are in the message handler path). 30 */ 31 32 static const struct inode_operations ceph_symlink_iops; 33 34 static void ceph_invalidate_work(struct work_struct *work); 35 static void ceph_writeback_work(struct work_struct *work); 36 static void ceph_vmtruncate_work(struct work_struct *work); 37 38 /* 39 * find or create an inode, given the ceph ino number 40 */ 41 static int ceph_set_ino_cb(struct inode *inode, void *data) 42 { 43 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data; 44 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data); 45 return 0; 46 } 47 48 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino) 49 { 50 struct inode *inode; 51 ino_t t = ceph_vino_to_ino(vino); 52 53 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino); 54 if (inode == NULL) 55 return ERR_PTR(-ENOMEM); 56 if (inode->i_state & I_NEW) { 57 dout("get_inode created new inode %p %llx.%llx ino %llx\n", 58 inode, ceph_vinop(inode), (u64)inode->i_ino); 59 unlock_new_inode(inode); 60 } 61 62 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino, 63 vino.snap, inode); 64 return inode; 65 } 66 67 /* 68 * get/constuct snapdir inode for a given directory 69 */ 70 struct inode *ceph_get_snapdir(struct inode *parent) 71 { 72 struct ceph_vino vino = { 73 .ino = ceph_ino(parent), 74 .snap = CEPH_SNAPDIR, 75 }; 76 struct inode *inode = ceph_get_inode(parent->i_sb, vino); 77 struct ceph_inode_info *ci = ceph_inode(inode); 78 79 BUG_ON(!S_ISDIR(parent->i_mode)); 80 if (IS_ERR(inode)) 81 return inode; 82 inode->i_mode = parent->i_mode; 83 inode->i_uid = parent->i_uid; 84 inode->i_gid = parent->i_gid; 85 inode->i_op = &ceph_dir_iops; 86 inode->i_fop = &ceph_dir_fops; 87 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */ 88 ci->i_rbytes = 0; 89 return inode; 90 } 91 92 const struct inode_operations ceph_file_iops = { 93 .permission = ceph_permission, 94 .setattr = ceph_setattr, 95 .getattr = ceph_getattr, 96 .setxattr = ceph_setxattr, 97 .getxattr = ceph_getxattr, 98 .listxattr = ceph_listxattr, 99 .removexattr = ceph_removexattr, 100 .get_acl = ceph_get_acl, 101 .set_acl = ceph_set_acl, 102 }; 103 104 105 /* 106 * We use a 'frag tree' to keep track of the MDS's directory fragments 107 * for a given inode (usually there is just a single fragment). We 108 * need to know when a child frag is delegated to a new MDS, or when 109 * it is flagged as replicated, so we can direct our requests 110 * accordingly. 111 */ 112 113 /* 114 * find/create a frag in the tree 115 */ 116 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci, 117 u32 f) 118 { 119 struct rb_node **p; 120 struct rb_node *parent = NULL; 121 struct ceph_inode_frag *frag; 122 int c; 123 124 p = &ci->i_fragtree.rb_node; 125 while (*p) { 126 parent = *p; 127 frag = rb_entry(parent, struct ceph_inode_frag, node); 128 c = ceph_frag_compare(f, frag->frag); 129 if (c < 0) 130 p = &(*p)->rb_left; 131 else if (c > 0) 132 p = &(*p)->rb_right; 133 else 134 return frag; 135 } 136 137 frag = kmalloc(sizeof(*frag), GFP_NOFS); 138 if (!frag) { 139 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx " 140 "frag %x\n", &ci->vfs_inode, 141 ceph_vinop(&ci->vfs_inode), f); 142 return ERR_PTR(-ENOMEM); 143 } 144 frag->frag = f; 145 frag->split_by = 0; 146 frag->mds = -1; 147 frag->ndist = 0; 148 149 rb_link_node(&frag->node, parent, p); 150 rb_insert_color(&frag->node, &ci->i_fragtree); 151 152 dout("get_or_create_frag added %llx.%llx frag %x\n", 153 ceph_vinop(&ci->vfs_inode), f); 154 return frag; 155 } 156 157 /* 158 * find a specific frag @f 159 */ 160 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f) 161 { 162 struct rb_node *n = ci->i_fragtree.rb_node; 163 164 while (n) { 165 struct ceph_inode_frag *frag = 166 rb_entry(n, struct ceph_inode_frag, node); 167 int c = ceph_frag_compare(f, frag->frag); 168 if (c < 0) 169 n = n->rb_left; 170 else if (c > 0) 171 n = n->rb_right; 172 else 173 return frag; 174 } 175 return NULL; 176 } 177 178 /* 179 * Choose frag containing the given value @v. If @pfrag is 180 * specified, copy the frag delegation info to the caller if 181 * it is present. 182 */ 183 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 184 struct ceph_inode_frag *pfrag, int *found) 185 { 186 u32 t = ceph_frag_make(0, 0); 187 struct ceph_inode_frag *frag; 188 unsigned nway, i; 189 u32 n; 190 191 if (found) 192 *found = 0; 193 194 while (1) { 195 WARN_ON(!ceph_frag_contains_value(t, v)); 196 frag = __ceph_find_frag(ci, t); 197 if (!frag) 198 break; /* t is a leaf */ 199 if (frag->split_by == 0) { 200 if (pfrag) 201 memcpy(pfrag, frag, sizeof(*pfrag)); 202 if (found) 203 *found = 1; 204 break; 205 } 206 207 /* choose child */ 208 nway = 1 << frag->split_by; 209 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t, 210 frag->split_by, nway); 211 for (i = 0; i < nway; i++) { 212 n = ceph_frag_make_child(t, frag->split_by, i); 213 if (ceph_frag_contains_value(n, v)) { 214 t = n; 215 break; 216 } 217 } 218 BUG_ON(i == nway); 219 } 220 dout("choose_frag(%x) = %x\n", v, t); 221 222 return t; 223 } 224 225 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 226 struct ceph_inode_frag *pfrag, int *found) 227 { 228 u32 ret; 229 mutex_lock(&ci->i_fragtree_mutex); 230 ret = __ceph_choose_frag(ci, v, pfrag, found); 231 mutex_unlock(&ci->i_fragtree_mutex); 232 return ret; 233 } 234 235 /* 236 * Process dirfrag (delegation) info from the mds. Include leaf 237 * fragment in tree ONLY if ndist > 0. Otherwise, only 238 * branches/splits are included in i_fragtree) 239 */ 240 static int ceph_fill_dirfrag(struct inode *inode, 241 struct ceph_mds_reply_dirfrag *dirinfo) 242 { 243 struct ceph_inode_info *ci = ceph_inode(inode); 244 struct ceph_inode_frag *frag; 245 u32 id = le32_to_cpu(dirinfo->frag); 246 int mds = le32_to_cpu(dirinfo->auth); 247 int ndist = le32_to_cpu(dirinfo->ndist); 248 int diri_auth = -1; 249 int i; 250 int err = 0; 251 252 spin_lock(&ci->i_ceph_lock); 253 if (ci->i_auth_cap) 254 diri_auth = ci->i_auth_cap->mds; 255 spin_unlock(&ci->i_ceph_lock); 256 257 mutex_lock(&ci->i_fragtree_mutex); 258 if (ndist == 0 && mds == diri_auth) { 259 /* no delegation info needed. */ 260 frag = __ceph_find_frag(ci, id); 261 if (!frag) 262 goto out; 263 if (frag->split_by == 0) { 264 /* tree leaf, remove */ 265 dout("fill_dirfrag removed %llx.%llx frag %x" 266 " (no ref)\n", ceph_vinop(inode), id); 267 rb_erase(&frag->node, &ci->i_fragtree); 268 kfree(frag); 269 } else { 270 /* tree branch, keep and clear */ 271 dout("fill_dirfrag cleared %llx.%llx frag %x" 272 " referral\n", ceph_vinop(inode), id); 273 frag->mds = -1; 274 frag->ndist = 0; 275 } 276 goto out; 277 } 278 279 280 /* find/add this frag to store mds delegation info */ 281 frag = __get_or_create_frag(ci, id); 282 if (IS_ERR(frag)) { 283 /* this is not the end of the world; we can continue 284 with bad/inaccurate delegation info */ 285 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n", 286 ceph_vinop(inode), le32_to_cpu(dirinfo->frag)); 287 err = -ENOMEM; 288 goto out; 289 } 290 291 frag->mds = mds; 292 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP); 293 for (i = 0; i < frag->ndist; i++) 294 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]); 295 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n", 296 ceph_vinop(inode), frag->frag, frag->ndist); 297 298 out: 299 mutex_unlock(&ci->i_fragtree_mutex); 300 return err; 301 } 302 303 static int ceph_fill_fragtree(struct inode *inode, 304 struct ceph_frag_tree_head *fragtree, 305 struct ceph_mds_reply_dirfrag *dirinfo) 306 { 307 struct ceph_inode_info *ci = ceph_inode(inode); 308 struct ceph_inode_frag *frag; 309 struct rb_node *rb_node; 310 int i; 311 u32 id, nsplits; 312 bool update = false; 313 314 mutex_lock(&ci->i_fragtree_mutex); 315 nsplits = le32_to_cpu(fragtree->nsplits); 316 if (nsplits) { 317 i = prandom_u32() % nsplits; 318 id = le32_to_cpu(fragtree->splits[i].frag); 319 if (!__ceph_find_frag(ci, id)) 320 update = true; 321 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) { 322 rb_node = rb_first(&ci->i_fragtree); 323 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 324 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node)) 325 update = true; 326 } 327 if (!update && dirinfo) { 328 id = le32_to_cpu(dirinfo->frag); 329 if (id != __ceph_choose_frag(ci, id, NULL, NULL)) 330 update = true; 331 } 332 if (!update) 333 goto out_unlock; 334 335 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode)); 336 rb_node = rb_first(&ci->i_fragtree); 337 for (i = 0; i < nsplits; i++) { 338 id = le32_to_cpu(fragtree->splits[i].frag); 339 frag = NULL; 340 while (rb_node) { 341 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 342 if (ceph_frag_compare(frag->frag, id) >= 0) { 343 if (frag->frag != id) 344 frag = NULL; 345 else 346 rb_node = rb_next(rb_node); 347 break; 348 } 349 rb_node = rb_next(rb_node); 350 rb_erase(&frag->node, &ci->i_fragtree); 351 kfree(frag); 352 frag = NULL; 353 } 354 if (!frag) { 355 frag = __get_or_create_frag(ci, id); 356 if (IS_ERR(frag)) 357 continue; 358 } 359 frag->split_by = le32_to_cpu(fragtree->splits[i].by); 360 dout(" frag %x split by %d\n", frag->frag, frag->split_by); 361 } 362 while (rb_node) { 363 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 364 rb_node = rb_next(rb_node); 365 rb_erase(&frag->node, &ci->i_fragtree); 366 kfree(frag); 367 } 368 out_unlock: 369 mutex_unlock(&ci->i_fragtree_mutex); 370 return 0; 371 } 372 373 /* 374 * initialize a newly allocated inode. 375 */ 376 struct inode *ceph_alloc_inode(struct super_block *sb) 377 { 378 struct ceph_inode_info *ci; 379 int i; 380 381 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS); 382 if (!ci) 383 return NULL; 384 385 dout("alloc_inode %p\n", &ci->vfs_inode); 386 387 spin_lock_init(&ci->i_ceph_lock); 388 389 ci->i_version = 0; 390 ci->i_time_warp_seq = 0; 391 ci->i_ceph_flags = 0; 392 atomic_set(&ci->i_release_count, 1); 393 atomic_set(&ci->i_complete_count, 0); 394 ci->i_symlink = NULL; 395 396 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout)); 397 398 ci->i_fragtree = RB_ROOT; 399 mutex_init(&ci->i_fragtree_mutex); 400 401 ci->i_xattrs.blob = NULL; 402 ci->i_xattrs.prealloc_blob = NULL; 403 ci->i_xattrs.dirty = false; 404 ci->i_xattrs.index = RB_ROOT; 405 ci->i_xattrs.count = 0; 406 ci->i_xattrs.names_size = 0; 407 ci->i_xattrs.vals_size = 0; 408 ci->i_xattrs.version = 0; 409 ci->i_xattrs.index_version = 0; 410 411 ci->i_caps = RB_ROOT; 412 ci->i_auth_cap = NULL; 413 ci->i_dirty_caps = 0; 414 ci->i_flushing_caps = 0; 415 INIT_LIST_HEAD(&ci->i_dirty_item); 416 INIT_LIST_HEAD(&ci->i_flushing_item); 417 ci->i_cap_flush_seq = 0; 418 ci->i_cap_flush_last_tid = 0; 419 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid)); 420 init_waitqueue_head(&ci->i_cap_wq); 421 ci->i_hold_caps_min = 0; 422 ci->i_hold_caps_max = 0; 423 INIT_LIST_HEAD(&ci->i_cap_delay_list); 424 INIT_LIST_HEAD(&ci->i_cap_snaps); 425 ci->i_head_snapc = NULL; 426 ci->i_snap_caps = 0; 427 428 for (i = 0; i < CEPH_FILE_MODE_NUM; i++) 429 ci->i_nr_by_mode[i] = 0; 430 431 mutex_init(&ci->i_truncate_mutex); 432 ci->i_truncate_seq = 0; 433 ci->i_truncate_size = 0; 434 ci->i_truncate_pending = 0; 435 436 ci->i_max_size = 0; 437 ci->i_reported_size = 0; 438 ci->i_wanted_max_size = 0; 439 ci->i_requested_max_size = 0; 440 441 ci->i_pin_ref = 0; 442 ci->i_rd_ref = 0; 443 ci->i_rdcache_ref = 0; 444 ci->i_wr_ref = 0; 445 ci->i_wb_ref = 0; 446 ci->i_wrbuffer_ref = 0; 447 ci->i_wrbuffer_ref_head = 0; 448 ci->i_shared_gen = 0; 449 ci->i_rdcache_gen = 0; 450 ci->i_rdcache_revoking = 0; 451 452 INIT_LIST_HEAD(&ci->i_unsafe_writes); 453 INIT_LIST_HEAD(&ci->i_unsafe_dirops); 454 spin_lock_init(&ci->i_unsafe_lock); 455 456 ci->i_snap_realm = NULL; 457 INIT_LIST_HEAD(&ci->i_snap_realm_item); 458 INIT_LIST_HEAD(&ci->i_snap_flush_item); 459 460 INIT_WORK(&ci->i_wb_work, ceph_writeback_work); 461 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work); 462 463 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work); 464 465 ceph_fscache_inode_init(ci); 466 467 return &ci->vfs_inode; 468 } 469 470 static void ceph_i_callback(struct rcu_head *head) 471 { 472 struct inode *inode = container_of(head, struct inode, i_rcu); 473 struct ceph_inode_info *ci = ceph_inode(inode); 474 475 kmem_cache_free(ceph_inode_cachep, ci); 476 } 477 478 void ceph_destroy_inode(struct inode *inode) 479 { 480 struct ceph_inode_info *ci = ceph_inode(inode); 481 struct ceph_inode_frag *frag; 482 struct rb_node *n; 483 484 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode)); 485 486 ceph_fscache_unregister_inode_cookie(ci); 487 488 ceph_queue_caps_release(inode); 489 490 /* 491 * we may still have a snap_realm reference if there are stray 492 * caps in i_snap_caps. 493 */ 494 if (ci->i_snap_realm) { 495 struct ceph_mds_client *mdsc = 496 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; 497 struct ceph_snap_realm *realm = ci->i_snap_realm; 498 499 dout(" dropping residual ref to snap realm %p\n", realm); 500 spin_lock(&realm->inodes_with_caps_lock); 501 list_del_init(&ci->i_snap_realm_item); 502 spin_unlock(&realm->inodes_with_caps_lock); 503 ceph_put_snap_realm(mdsc, realm); 504 } 505 506 kfree(ci->i_symlink); 507 while ((n = rb_first(&ci->i_fragtree)) != NULL) { 508 frag = rb_entry(n, struct ceph_inode_frag, node); 509 rb_erase(n, &ci->i_fragtree); 510 kfree(frag); 511 } 512 513 __ceph_destroy_xattrs(ci); 514 if (ci->i_xattrs.blob) 515 ceph_buffer_put(ci->i_xattrs.blob); 516 if (ci->i_xattrs.prealloc_blob) 517 ceph_buffer_put(ci->i_xattrs.prealloc_blob); 518 519 call_rcu(&inode->i_rcu, ceph_i_callback); 520 } 521 522 int ceph_drop_inode(struct inode *inode) 523 { 524 /* 525 * Positve dentry and corresponding inode are always accompanied 526 * in MDS reply. So no need to keep inode in the cache after 527 * dropping all its aliases. 528 */ 529 return 1; 530 } 531 532 /* 533 * Helpers to fill in size, ctime, mtime, and atime. We have to be 534 * careful because either the client or MDS may have more up to date 535 * info, depending on which capabilities are held, and whether 536 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime 537 * and size are monotonically increasing, except when utimes() or 538 * truncate() increments the corresponding _seq values.) 539 */ 540 int ceph_fill_file_size(struct inode *inode, int issued, 541 u32 truncate_seq, u64 truncate_size, u64 size) 542 { 543 struct ceph_inode_info *ci = ceph_inode(inode); 544 int queue_trunc = 0; 545 546 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 || 547 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) { 548 dout("size %lld -> %llu\n", inode->i_size, size); 549 inode->i_size = size; 550 inode->i_blocks = (size + (1<<9) - 1) >> 9; 551 ci->i_reported_size = size; 552 if (truncate_seq != ci->i_truncate_seq) { 553 dout("truncate_seq %u -> %u\n", 554 ci->i_truncate_seq, truncate_seq); 555 ci->i_truncate_seq = truncate_seq; 556 557 /* the MDS should have revoked these caps */ 558 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL | 559 CEPH_CAP_FILE_RD | 560 CEPH_CAP_FILE_WR | 561 CEPH_CAP_FILE_LAZYIO)); 562 /* 563 * If we hold relevant caps, or in the case where we're 564 * not the only client referencing this file and we 565 * don't hold those caps, then we need to check whether 566 * the file is either opened or mmaped 567 */ 568 if ((issued & (CEPH_CAP_FILE_CACHE| 569 CEPH_CAP_FILE_BUFFER)) || 570 mapping_mapped(inode->i_mapping) || 571 __ceph_caps_file_wanted(ci)) { 572 ci->i_truncate_pending++; 573 queue_trunc = 1; 574 } 575 } 576 } 577 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 && 578 ci->i_truncate_size != truncate_size) { 579 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size, 580 truncate_size); 581 ci->i_truncate_size = truncate_size; 582 } 583 584 if (queue_trunc) 585 ceph_fscache_invalidate(inode); 586 587 return queue_trunc; 588 } 589 590 void ceph_fill_file_time(struct inode *inode, int issued, 591 u64 time_warp_seq, struct timespec *ctime, 592 struct timespec *mtime, struct timespec *atime) 593 { 594 struct ceph_inode_info *ci = ceph_inode(inode); 595 int warn = 0; 596 597 if (issued & (CEPH_CAP_FILE_EXCL| 598 CEPH_CAP_FILE_WR| 599 CEPH_CAP_FILE_BUFFER| 600 CEPH_CAP_AUTH_EXCL| 601 CEPH_CAP_XATTR_EXCL)) { 602 if (timespec_compare(ctime, &inode->i_ctime) > 0) { 603 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n", 604 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 605 ctime->tv_sec, ctime->tv_nsec); 606 inode->i_ctime = *ctime; 607 } 608 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) { 609 /* the MDS did a utimes() */ 610 dout("mtime %ld.%09ld -> %ld.%09ld " 611 "tw %d -> %d\n", 612 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 613 mtime->tv_sec, mtime->tv_nsec, 614 ci->i_time_warp_seq, (int)time_warp_seq); 615 616 inode->i_mtime = *mtime; 617 inode->i_atime = *atime; 618 ci->i_time_warp_seq = time_warp_seq; 619 } else if (time_warp_seq == ci->i_time_warp_seq) { 620 /* nobody did utimes(); take the max */ 621 if (timespec_compare(mtime, &inode->i_mtime) > 0) { 622 dout("mtime %ld.%09ld -> %ld.%09ld inc\n", 623 inode->i_mtime.tv_sec, 624 inode->i_mtime.tv_nsec, 625 mtime->tv_sec, mtime->tv_nsec); 626 inode->i_mtime = *mtime; 627 } 628 if (timespec_compare(atime, &inode->i_atime) > 0) { 629 dout("atime %ld.%09ld -> %ld.%09ld inc\n", 630 inode->i_atime.tv_sec, 631 inode->i_atime.tv_nsec, 632 atime->tv_sec, atime->tv_nsec); 633 inode->i_atime = *atime; 634 } 635 } else if (issued & CEPH_CAP_FILE_EXCL) { 636 /* we did a utimes(); ignore mds values */ 637 } else { 638 warn = 1; 639 } 640 } else { 641 /* we have no write|excl caps; whatever the MDS says is true */ 642 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) { 643 inode->i_ctime = *ctime; 644 inode->i_mtime = *mtime; 645 inode->i_atime = *atime; 646 ci->i_time_warp_seq = time_warp_seq; 647 } else { 648 warn = 1; 649 } 650 } 651 if (warn) /* time_warp_seq shouldn't go backwards */ 652 dout("%p mds time_warp_seq %llu < %u\n", 653 inode, time_warp_seq, ci->i_time_warp_seq); 654 } 655 656 /* 657 * Populate an inode based on info from mds. May be called on new or 658 * existing inodes. 659 */ 660 static int fill_inode(struct inode *inode, 661 struct ceph_mds_reply_info_in *iinfo, 662 struct ceph_mds_reply_dirfrag *dirinfo, 663 struct ceph_mds_session *session, 664 unsigned long ttl_from, int cap_fmode, 665 struct ceph_cap_reservation *caps_reservation) 666 { 667 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; 668 struct ceph_mds_reply_inode *info = iinfo->in; 669 struct ceph_inode_info *ci = ceph_inode(inode); 670 int issued = 0, implemented, new_issued; 671 struct timespec mtime, atime, ctime; 672 struct ceph_buffer *xattr_blob = NULL; 673 struct ceph_cap *new_cap = NULL; 674 int err = 0; 675 bool wake = false; 676 bool queue_trunc = false; 677 bool new_version = false; 678 679 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n", 680 inode, ceph_vinop(inode), le64_to_cpu(info->version), 681 ci->i_version); 682 683 /* prealloc new cap struct */ 684 if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP) 685 new_cap = ceph_get_cap(mdsc, caps_reservation); 686 687 /* 688 * prealloc xattr data, if it looks like we'll need it. only 689 * if len > 4 (meaning there are actually xattrs; the first 4 690 * bytes are the xattr count). 691 */ 692 if (iinfo->xattr_len > 4) { 693 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS); 694 if (!xattr_blob) 695 pr_err("fill_inode ENOMEM xattr blob %d bytes\n", 696 iinfo->xattr_len); 697 } 698 699 spin_lock(&ci->i_ceph_lock); 700 701 /* 702 * provided version will be odd if inode value is projected, 703 * even if stable. skip the update if we have newer stable 704 * info (ours>=theirs, e.g. due to racing mds replies), unless 705 * we are getting projected (unstable) info (in which case the 706 * version is odd, and we want ours>theirs). 707 * us them 708 * 2 2 skip 709 * 3 2 skip 710 * 3 3 update 711 */ 712 if (ci->i_version == 0 || 713 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) && 714 le64_to_cpu(info->version) > (ci->i_version & ~1))) 715 new_version = true; 716 717 issued = __ceph_caps_issued(ci, &implemented); 718 issued |= implemented | __ceph_caps_dirty(ci); 719 new_issued = ~issued & le32_to_cpu(info->cap.caps); 720 721 /* update inode */ 722 ci->i_version = le64_to_cpu(info->version); 723 inode->i_version++; 724 inode->i_rdev = le32_to_cpu(info->rdev); 725 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1; 726 727 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) && 728 (issued & CEPH_CAP_AUTH_EXCL) == 0) { 729 inode->i_mode = le32_to_cpu(info->mode); 730 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid)); 731 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid)); 732 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, 733 from_kuid(&init_user_ns, inode->i_uid), 734 from_kgid(&init_user_ns, inode->i_gid)); 735 } 736 737 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) && 738 (issued & CEPH_CAP_LINK_EXCL) == 0) 739 set_nlink(inode, le32_to_cpu(info->nlink)); 740 741 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) { 742 /* be careful with mtime, atime, size */ 743 ceph_decode_timespec(&atime, &info->atime); 744 ceph_decode_timespec(&mtime, &info->mtime); 745 ceph_decode_timespec(&ctime, &info->ctime); 746 ceph_fill_file_time(inode, issued, 747 le32_to_cpu(info->time_warp_seq), 748 &ctime, &mtime, &atime); 749 } 750 751 if (new_version || 752 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) { 753 ci->i_layout = info->layout; 754 queue_trunc = ceph_fill_file_size(inode, issued, 755 le32_to_cpu(info->truncate_seq), 756 le64_to_cpu(info->truncate_size), 757 le64_to_cpu(info->size)); 758 /* only update max_size on auth cap */ 759 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) && 760 ci->i_max_size != le64_to_cpu(info->max_size)) { 761 dout("max_size %lld -> %llu\n", ci->i_max_size, 762 le64_to_cpu(info->max_size)); 763 ci->i_max_size = le64_to_cpu(info->max_size); 764 } 765 } 766 767 /* xattrs */ 768 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */ 769 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) && 770 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) { 771 if (ci->i_xattrs.blob) 772 ceph_buffer_put(ci->i_xattrs.blob); 773 ci->i_xattrs.blob = xattr_blob; 774 if (xattr_blob) 775 memcpy(ci->i_xattrs.blob->vec.iov_base, 776 iinfo->xattr_data, iinfo->xattr_len); 777 ci->i_xattrs.version = le64_to_cpu(info->xattr_version); 778 ceph_forget_all_cached_acls(inode); 779 xattr_blob = NULL; 780 } 781 782 inode->i_mapping->a_ops = &ceph_aops; 783 inode->i_mapping->backing_dev_info = 784 &ceph_sb_to_client(inode->i_sb)->backing_dev_info; 785 786 switch (inode->i_mode & S_IFMT) { 787 case S_IFIFO: 788 case S_IFBLK: 789 case S_IFCHR: 790 case S_IFSOCK: 791 init_special_inode(inode, inode->i_mode, inode->i_rdev); 792 inode->i_op = &ceph_file_iops; 793 break; 794 case S_IFREG: 795 inode->i_op = &ceph_file_iops; 796 inode->i_fop = &ceph_file_fops; 797 break; 798 case S_IFLNK: 799 inode->i_op = &ceph_symlink_iops; 800 if (!ci->i_symlink) { 801 u32 symlen = iinfo->symlink_len; 802 char *sym; 803 804 spin_unlock(&ci->i_ceph_lock); 805 806 err = -EINVAL; 807 if (WARN_ON(symlen != inode->i_size)) 808 goto out; 809 810 err = -ENOMEM; 811 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS); 812 if (!sym) 813 goto out; 814 815 spin_lock(&ci->i_ceph_lock); 816 if (!ci->i_symlink) 817 ci->i_symlink = sym; 818 else 819 kfree(sym); /* lost a race */ 820 } 821 break; 822 case S_IFDIR: 823 inode->i_op = &ceph_dir_iops; 824 inode->i_fop = &ceph_dir_fops; 825 826 ci->i_dir_layout = iinfo->dir_layout; 827 828 ci->i_files = le64_to_cpu(info->files); 829 ci->i_subdirs = le64_to_cpu(info->subdirs); 830 ci->i_rbytes = le64_to_cpu(info->rbytes); 831 ci->i_rfiles = le64_to_cpu(info->rfiles); 832 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs); 833 ceph_decode_timespec(&ci->i_rctime, &info->rctime); 834 break; 835 default: 836 pr_err("fill_inode %llx.%llx BAD mode 0%o\n", 837 ceph_vinop(inode), inode->i_mode); 838 } 839 840 /* set dir completion flag? */ 841 if (S_ISDIR(inode->i_mode) && 842 ci->i_files == 0 && ci->i_subdirs == 0 && 843 ceph_snap(inode) == CEPH_NOSNAP && 844 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) && 845 (issued & CEPH_CAP_FILE_EXCL) == 0 && 846 !__ceph_dir_is_complete(ci)) { 847 dout(" marking %p complete (empty)\n", inode); 848 __ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count)); 849 } 850 851 /* were we issued a capability? */ 852 if (info->cap.caps) { 853 if (ceph_snap(inode) == CEPH_NOSNAP) { 854 ceph_add_cap(inode, session, 855 le64_to_cpu(info->cap.cap_id), 856 cap_fmode, 857 le32_to_cpu(info->cap.caps), 858 le32_to_cpu(info->cap.wanted), 859 le32_to_cpu(info->cap.seq), 860 le32_to_cpu(info->cap.mseq), 861 le64_to_cpu(info->cap.realm), 862 info->cap.flags, &new_cap); 863 wake = true; 864 } else { 865 dout(" %p got snap_caps %s\n", inode, 866 ceph_cap_string(le32_to_cpu(info->cap.caps))); 867 ci->i_snap_caps |= le32_to_cpu(info->cap.caps); 868 if (cap_fmode >= 0) 869 __ceph_get_fmode(ci, cap_fmode); 870 } 871 } else if (cap_fmode >= 0) { 872 pr_warn("mds issued no caps on %llx.%llx\n", 873 ceph_vinop(inode)); 874 __ceph_get_fmode(ci, cap_fmode); 875 } 876 spin_unlock(&ci->i_ceph_lock); 877 878 if (wake) 879 wake_up_all(&ci->i_cap_wq); 880 881 /* queue truncate if we saw i_size decrease */ 882 if (queue_trunc) 883 ceph_queue_vmtruncate(inode); 884 885 /* populate frag tree */ 886 if (S_ISDIR(inode->i_mode)) 887 ceph_fill_fragtree(inode, &info->fragtree, dirinfo); 888 889 /* update delegation info? */ 890 if (dirinfo) 891 ceph_fill_dirfrag(inode, dirinfo); 892 893 err = 0; 894 out: 895 if (new_cap) 896 ceph_put_cap(mdsc, new_cap); 897 if (xattr_blob) 898 ceph_buffer_put(xattr_blob); 899 return err; 900 } 901 902 /* 903 * caller should hold session s_mutex. 904 */ 905 static void update_dentry_lease(struct dentry *dentry, 906 struct ceph_mds_reply_lease *lease, 907 struct ceph_mds_session *session, 908 unsigned long from_time) 909 { 910 struct ceph_dentry_info *di = ceph_dentry(dentry); 911 long unsigned duration = le32_to_cpu(lease->duration_ms); 912 long unsigned ttl = from_time + (duration * HZ) / 1000; 913 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000; 914 struct inode *dir; 915 916 /* only track leases on regular dentries */ 917 if (dentry->d_op != &ceph_dentry_ops) 918 return; 919 920 spin_lock(&dentry->d_lock); 921 dout("update_dentry_lease %p duration %lu ms ttl %lu\n", 922 dentry, duration, ttl); 923 924 /* make lease_rdcache_gen match directory */ 925 dir = dentry->d_parent->d_inode; 926 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen; 927 928 if (duration == 0) 929 goto out_unlock; 930 931 if (di->lease_gen == session->s_cap_gen && 932 time_before(ttl, dentry->d_time)) 933 goto out_unlock; /* we already have a newer lease. */ 934 935 if (di->lease_session && di->lease_session != session) 936 goto out_unlock; 937 938 ceph_dentry_lru_touch(dentry); 939 940 if (!di->lease_session) 941 di->lease_session = ceph_get_mds_session(session); 942 di->lease_gen = session->s_cap_gen; 943 di->lease_seq = le32_to_cpu(lease->seq); 944 di->lease_renew_after = half_ttl; 945 di->lease_renew_from = 0; 946 dentry->d_time = ttl; 947 out_unlock: 948 spin_unlock(&dentry->d_lock); 949 return; 950 } 951 952 /* 953 * splice a dentry to an inode. 954 * caller must hold directory i_mutex for this to be safe. 955 * 956 * we will only rehash the resulting dentry if @prehash is 957 * true; @prehash will be set to false (for the benefit of 958 * the caller) if we fail. 959 */ 960 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in, 961 bool *prehash) 962 { 963 struct dentry *realdn; 964 965 BUG_ON(dn->d_inode); 966 967 /* dn must be unhashed */ 968 if (!d_unhashed(dn)) 969 d_drop(dn); 970 realdn = d_splice_alias(in, dn); 971 if (IS_ERR(realdn)) { 972 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n", 973 PTR_ERR(realdn), dn, in, ceph_vinop(in)); 974 if (prehash) 975 *prehash = false; /* don't rehash on error */ 976 dn = realdn; /* note realdn contains the error */ 977 goto out; 978 } else if (realdn) { 979 dout("dn %p (%d) spliced with %p (%d) " 980 "inode %p ino %llx.%llx\n", 981 dn, d_count(dn), 982 realdn, d_count(realdn), 983 realdn->d_inode, ceph_vinop(realdn->d_inode)); 984 dput(dn); 985 dn = realdn; 986 } else { 987 BUG_ON(!ceph_dentry(dn)); 988 dout("dn %p attached to %p ino %llx.%llx\n", 989 dn, dn->d_inode, ceph_vinop(dn->d_inode)); 990 } 991 if ((!prehash || *prehash) && d_unhashed(dn)) 992 d_rehash(dn); 993 out: 994 return dn; 995 } 996 997 /* 998 * Incorporate results into the local cache. This is either just 999 * one inode, or a directory, dentry, and possibly linked-to inode (e.g., 1000 * after a lookup). 1001 * 1002 * A reply may contain 1003 * a directory inode along with a dentry. 1004 * and/or a target inode 1005 * 1006 * Called with snap_rwsem (read). 1007 */ 1008 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 1009 struct ceph_mds_session *session) 1010 { 1011 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1012 struct inode *in = NULL; 1013 struct ceph_vino vino; 1014 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 1015 int err = 0; 1016 1017 dout("fill_trace %p is_dentry %d is_target %d\n", req, 1018 rinfo->head->is_dentry, rinfo->head->is_target); 1019 1020 #if 0 1021 /* 1022 * Debugging hook: 1023 * 1024 * If we resend completed ops to a recovering mds, we get no 1025 * trace. Since that is very rare, pretend this is the case 1026 * to ensure the 'no trace' handlers in the callers behave. 1027 * 1028 * Fill in inodes unconditionally to avoid breaking cap 1029 * invariants. 1030 */ 1031 if (rinfo->head->op & CEPH_MDS_OP_WRITE) { 1032 pr_info("fill_trace faking empty trace on %lld %s\n", 1033 req->r_tid, ceph_mds_op_name(rinfo->head->op)); 1034 if (rinfo->head->is_dentry) { 1035 rinfo->head->is_dentry = 0; 1036 err = fill_inode(req->r_locked_dir, 1037 &rinfo->diri, rinfo->dirfrag, 1038 session, req->r_request_started, -1); 1039 } 1040 if (rinfo->head->is_target) { 1041 rinfo->head->is_target = 0; 1042 ininfo = rinfo->targeti.in; 1043 vino.ino = le64_to_cpu(ininfo->ino); 1044 vino.snap = le64_to_cpu(ininfo->snapid); 1045 in = ceph_get_inode(sb, vino); 1046 err = fill_inode(in, &rinfo->targeti, NULL, 1047 session, req->r_request_started, 1048 req->r_fmode); 1049 iput(in); 1050 } 1051 } 1052 #endif 1053 1054 if (!rinfo->head->is_target && !rinfo->head->is_dentry) { 1055 dout("fill_trace reply is empty!\n"); 1056 if (rinfo->head->result == 0 && req->r_locked_dir) 1057 ceph_invalidate_dir_request(req); 1058 return 0; 1059 } 1060 1061 if (rinfo->head->is_dentry) { 1062 struct inode *dir = req->r_locked_dir; 1063 1064 if (dir) { 1065 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag, 1066 session, req->r_request_started, -1, 1067 &req->r_caps_reservation); 1068 if (err < 0) 1069 goto done; 1070 } else { 1071 WARN_ON_ONCE(1); 1072 } 1073 1074 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) { 1075 struct qstr dname; 1076 struct dentry *dn, *parent; 1077 1078 BUG_ON(!rinfo->head->is_target); 1079 BUG_ON(req->r_dentry); 1080 1081 parent = d_find_any_alias(dir); 1082 BUG_ON(!parent); 1083 1084 dname.name = rinfo->dname; 1085 dname.len = rinfo->dname_len; 1086 dname.hash = full_name_hash(dname.name, dname.len); 1087 vino.ino = le64_to_cpu(rinfo->targeti.in->ino); 1088 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid); 1089 retry_lookup: 1090 dn = d_lookup(parent, &dname); 1091 dout("d_lookup on parent=%p name=%.*s got %p\n", 1092 parent, dname.len, dname.name, dn); 1093 1094 if (!dn) { 1095 dn = d_alloc(parent, &dname); 1096 dout("d_alloc %p '%.*s' = %p\n", parent, 1097 dname.len, dname.name, dn); 1098 if (dn == NULL) { 1099 dput(parent); 1100 err = -ENOMEM; 1101 goto done; 1102 } 1103 err = ceph_init_dentry(dn); 1104 if (err < 0) { 1105 dput(dn); 1106 dput(parent); 1107 goto done; 1108 } 1109 } else if (dn->d_inode && 1110 (ceph_ino(dn->d_inode) != vino.ino || 1111 ceph_snap(dn->d_inode) != vino.snap)) { 1112 dout(" dn %p points to wrong inode %p\n", 1113 dn, dn->d_inode); 1114 d_delete(dn); 1115 dput(dn); 1116 goto retry_lookup; 1117 } 1118 1119 req->r_dentry = dn; 1120 dput(parent); 1121 } 1122 } 1123 1124 if (rinfo->head->is_target) { 1125 vino.ino = le64_to_cpu(rinfo->targeti.in->ino); 1126 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid); 1127 1128 in = ceph_get_inode(sb, vino); 1129 if (IS_ERR(in)) { 1130 err = PTR_ERR(in); 1131 goto done; 1132 } 1133 req->r_target_inode = in; 1134 1135 err = fill_inode(in, &rinfo->targeti, NULL, 1136 session, req->r_request_started, 1137 (!req->r_aborted && rinfo->head->result == 0) ? 1138 req->r_fmode : -1, 1139 &req->r_caps_reservation); 1140 if (err < 0) { 1141 pr_err("fill_inode badness %p %llx.%llx\n", 1142 in, ceph_vinop(in)); 1143 goto done; 1144 } 1145 } 1146 1147 /* 1148 * ignore null lease/binding on snapdir ENOENT, or else we 1149 * will have trouble splicing in the virtual snapdir later 1150 */ 1151 if (rinfo->head->is_dentry && !req->r_aborted && 1152 req->r_locked_dir && 1153 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name, 1154 fsc->mount_options->snapdir_name, 1155 req->r_dentry->d_name.len))) { 1156 /* 1157 * lookup link rename : null -> possibly existing inode 1158 * mknod symlink mkdir : null -> new inode 1159 * unlink : linked -> null 1160 */ 1161 struct inode *dir = req->r_locked_dir; 1162 struct dentry *dn = req->r_dentry; 1163 bool have_dir_cap, have_lease; 1164 1165 BUG_ON(!dn); 1166 BUG_ON(!dir); 1167 BUG_ON(dn->d_parent->d_inode != dir); 1168 BUG_ON(ceph_ino(dir) != 1169 le64_to_cpu(rinfo->diri.in->ino)); 1170 BUG_ON(ceph_snap(dir) != 1171 le64_to_cpu(rinfo->diri.in->snapid)); 1172 1173 /* do we have a lease on the whole dir? */ 1174 have_dir_cap = 1175 (le32_to_cpu(rinfo->diri.in->cap.caps) & 1176 CEPH_CAP_FILE_SHARED); 1177 1178 /* do we have a dn lease? */ 1179 have_lease = have_dir_cap || 1180 le32_to_cpu(rinfo->dlease->duration_ms); 1181 if (!have_lease) 1182 dout("fill_trace no dentry lease or dir cap\n"); 1183 1184 /* rename? */ 1185 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) { 1186 struct inode *olddir = req->r_old_dentry_dir; 1187 BUG_ON(!olddir); 1188 1189 dout(" src %p '%pd' dst %p '%pd'\n", 1190 req->r_old_dentry, 1191 req->r_old_dentry, 1192 dn, dn); 1193 dout("fill_trace doing d_move %p -> %p\n", 1194 req->r_old_dentry, dn); 1195 1196 d_move(req->r_old_dentry, dn); 1197 dout(" src %p '%pd' dst %p '%pd'\n", 1198 req->r_old_dentry, 1199 req->r_old_dentry, 1200 dn, dn); 1201 1202 /* ensure target dentry is invalidated, despite 1203 rehashing bug in vfs_rename_dir */ 1204 ceph_invalidate_dentry_lease(dn); 1205 1206 /* d_move screws up sibling dentries' offsets */ 1207 ceph_dir_clear_complete(dir); 1208 ceph_dir_clear_complete(olddir); 1209 1210 dout("dn %p gets new offset %lld\n", req->r_old_dentry, 1211 ceph_dentry(req->r_old_dentry)->offset); 1212 1213 dn = req->r_old_dentry; /* use old_dentry */ 1214 } 1215 1216 /* null dentry? */ 1217 if (!rinfo->head->is_target) { 1218 dout("fill_trace null dentry\n"); 1219 if (dn->d_inode) { 1220 dout("d_delete %p\n", dn); 1221 d_delete(dn); 1222 } else { 1223 dout("d_instantiate %p NULL\n", dn); 1224 d_instantiate(dn, NULL); 1225 if (have_lease && d_unhashed(dn)) 1226 d_rehash(dn); 1227 update_dentry_lease(dn, rinfo->dlease, 1228 session, 1229 req->r_request_started); 1230 } 1231 goto done; 1232 } 1233 1234 /* attach proper inode */ 1235 if (!dn->d_inode) { 1236 ceph_dir_clear_complete(dir); 1237 ihold(in); 1238 dn = splice_dentry(dn, in, &have_lease); 1239 if (IS_ERR(dn)) { 1240 err = PTR_ERR(dn); 1241 goto done; 1242 } 1243 req->r_dentry = dn; /* may have spliced */ 1244 } else if (dn->d_inode && dn->d_inode != in) { 1245 dout(" %p links to %p %llx.%llx, not %llx.%llx\n", 1246 dn, dn->d_inode, ceph_vinop(dn->d_inode), 1247 ceph_vinop(in)); 1248 have_lease = false; 1249 } 1250 1251 if (have_lease) 1252 update_dentry_lease(dn, rinfo->dlease, session, 1253 req->r_request_started); 1254 dout(" final dn %p\n", dn); 1255 } else if (!req->r_aborted && 1256 (req->r_op == CEPH_MDS_OP_LOOKUPSNAP || 1257 req->r_op == CEPH_MDS_OP_MKSNAP)) { 1258 struct dentry *dn = req->r_dentry; 1259 struct inode *dir = req->r_locked_dir; 1260 1261 /* fill out a snapdir LOOKUPSNAP dentry */ 1262 BUG_ON(!dn); 1263 BUG_ON(!dir); 1264 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR); 1265 dout(" linking snapped dir %p to dn %p\n", in, dn); 1266 ceph_dir_clear_complete(dir); 1267 ihold(in); 1268 dn = splice_dentry(dn, in, NULL); 1269 if (IS_ERR(dn)) { 1270 err = PTR_ERR(dn); 1271 goto done; 1272 } 1273 req->r_dentry = dn; /* may have spliced */ 1274 } 1275 done: 1276 dout("fill_trace done err=%d\n", err); 1277 return err; 1278 } 1279 1280 /* 1281 * Prepopulate our cache with readdir results, leases, etc. 1282 */ 1283 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req, 1284 struct ceph_mds_session *session) 1285 { 1286 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1287 int i, err = 0; 1288 1289 for (i = 0; i < rinfo->dir_nr; i++) { 1290 struct ceph_vino vino; 1291 struct inode *in; 1292 int rc; 1293 1294 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino); 1295 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid); 1296 1297 in = ceph_get_inode(req->r_dentry->d_sb, vino); 1298 if (IS_ERR(in)) { 1299 err = PTR_ERR(in); 1300 dout("new_inode badness got %d\n", err); 1301 continue; 1302 } 1303 rc = fill_inode(in, &rinfo->dir_in[i], NULL, session, 1304 req->r_request_started, -1, 1305 &req->r_caps_reservation); 1306 if (rc < 0) { 1307 pr_err("fill_inode badness on %p got %d\n", in, rc); 1308 err = rc; 1309 continue; 1310 } 1311 } 1312 1313 return err; 1314 } 1315 1316 int ceph_readdir_prepopulate(struct ceph_mds_request *req, 1317 struct ceph_mds_session *session) 1318 { 1319 struct dentry *parent = req->r_dentry; 1320 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1321 struct qstr dname; 1322 struct dentry *dn; 1323 struct inode *in; 1324 int err = 0, ret, i; 1325 struct inode *snapdir = NULL; 1326 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base; 1327 struct ceph_dentry_info *di; 1328 u64 r_readdir_offset = req->r_readdir_offset; 1329 u32 frag = le32_to_cpu(rhead->args.readdir.frag); 1330 1331 if (rinfo->dir_dir && 1332 le32_to_cpu(rinfo->dir_dir->frag) != frag) { 1333 dout("readdir_prepopulate got new frag %x -> %x\n", 1334 frag, le32_to_cpu(rinfo->dir_dir->frag)); 1335 frag = le32_to_cpu(rinfo->dir_dir->frag); 1336 if (ceph_frag_is_leftmost(frag)) 1337 r_readdir_offset = 2; 1338 else 1339 r_readdir_offset = 0; 1340 } 1341 1342 if (req->r_aborted) 1343 return readdir_prepopulate_inodes_only(req, session); 1344 1345 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) { 1346 snapdir = ceph_get_snapdir(parent->d_inode); 1347 parent = d_find_alias(snapdir); 1348 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n", 1349 rinfo->dir_nr, parent); 1350 } else { 1351 dout("readdir_prepopulate %d items under dn %p\n", 1352 rinfo->dir_nr, parent); 1353 if (rinfo->dir_dir) 1354 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir); 1355 } 1356 1357 /* FIXME: release caps/leases if error occurs */ 1358 for (i = 0; i < rinfo->dir_nr; i++) { 1359 struct ceph_vino vino; 1360 1361 dname.name = rinfo->dir_dname[i]; 1362 dname.len = rinfo->dir_dname_len[i]; 1363 dname.hash = full_name_hash(dname.name, dname.len); 1364 1365 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino); 1366 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid); 1367 1368 retry_lookup: 1369 dn = d_lookup(parent, &dname); 1370 dout("d_lookup on parent=%p name=%.*s got %p\n", 1371 parent, dname.len, dname.name, dn); 1372 1373 if (!dn) { 1374 dn = d_alloc(parent, &dname); 1375 dout("d_alloc %p '%.*s' = %p\n", parent, 1376 dname.len, dname.name, dn); 1377 if (dn == NULL) { 1378 dout("d_alloc badness\n"); 1379 err = -ENOMEM; 1380 goto out; 1381 } 1382 ret = ceph_init_dentry(dn); 1383 if (ret < 0) { 1384 dput(dn); 1385 err = ret; 1386 goto out; 1387 } 1388 } else if (dn->d_inode && 1389 (ceph_ino(dn->d_inode) != vino.ino || 1390 ceph_snap(dn->d_inode) != vino.snap)) { 1391 dout(" dn %p points to wrong inode %p\n", 1392 dn, dn->d_inode); 1393 d_delete(dn); 1394 dput(dn); 1395 goto retry_lookup; 1396 } else { 1397 /* reorder parent's d_subdirs */ 1398 spin_lock(&parent->d_lock); 1399 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED); 1400 list_move(&dn->d_child, &parent->d_subdirs); 1401 spin_unlock(&dn->d_lock); 1402 spin_unlock(&parent->d_lock); 1403 } 1404 1405 /* inode */ 1406 if (dn->d_inode) { 1407 in = dn->d_inode; 1408 } else { 1409 in = ceph_get_inode(parent->d_sb, vino); 1410 if (IS_ERR(in)) { 1411 dout("new_inode badness\n"); 1412 d_drop(dn); 1413 dput(dn); 1414 err = PTR_ERR(in); 1415 goto out; 1416 } 1417 } 1418 1419 if (fill_inode(in, &rinfo->dir_in[i], NULL, session, 1420 req->r_request_started, -1, 1421 &req->r_caps_reservation) < 0) { 1422 pr_err("fill_inode badness on %p\n", in); 1423 if (!dn->d_inode) 1424 iput(in); 1425 d_drop(dn); 1426 goto next_item; 1427 } 1428 1429 if (!dn->d_inode) { 1430 dn = splice_dentry(dn, in, NULL); 1431 if (IS_ERR(dn)) { 1432 err = PTR_ERR(dn); 1433 dn = NULL; 1434 goto next_item; 1435 } 1436 } 1437 1438 di = dn->d_fsdata; 1439 di->offset = ceph_make_fpos(frag, i + r_readdir_offset); 1440 1441 update_dentry_lease(dn, rinfo->dir_dlease[i], 1442 req->r_session, 1443 req->r_request_started); 1444 next_item: 1445 if (dn) 1446 dput(dn); 1447 } 1448 if (err == 0) 1449 req->r_did_prepopulate = true; 1450 1451 out: 1452 if (snapdir) { 1453 iput(snapdir); 1454 dput(parent); 1455 } 1456 dout("readdir_prepopulate done\n"); 1457 return err; 1458 } 1459 1460 int ceph_inode_set_size(struct inode *inode, loff_t size) 1461 { 1462 struct ceph_inode_info *ci = ceph_inode(inode); 1463 int ret = 0; 1464 1465 spin_lock(&ci->i_ceph_lock); 1466 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size); 1467 inode->i_size = size; 1468 inode->i_blocks = (size + (1 << 9) - 1) >> 9; 1469 1470 /* tell the MDS if we are approaching max_size */ 1471 if ((size << 1) >= ci->i_max_size && 1472 (ci->i_reported_size << 1) < ci->i_max_size) 1473 ret = 1; 1474 1475 spin_unlock(&ci->i_ceph_lock); 1476 return ret; 1477 } 1478 1479 /* 1480 * Write back inode data in a worker thread. (This can't be done 1481 * in the message handler context.) 1482 */ 1483 void ceph_queue_writeback(struct inode *inode) 1484 { 1485 ihold(inode); 1486 if (queue_work(ceph_inode_to_client(inode)->wb_wq, 1487 &ceph_inode(inode)->i_wb_work)) { 1488 dout("ceph_queue_writeback %p\n", inode); 1489 } else { 1490 dout("ceph_queue_writeback %p failed\n", inode); 1491 iput(inode); 1492 } 1493 } 1494 1495 static void ceph_writeback_work(struct work_struct *work) 1496 { 1497 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1498 i_wb_work); 1499 struct inode *inode = &ci->vfs_inode; 1500 1501 dout("writeback %p\n", inode); 1502 filemap_fdatawrite(&inode->i_data); 1503 iput(inode); 1504 } 1505 1506 /* 1507 * queue an async invalidation 1508 */ 1509 void ceph_queue_invalidate(struct inode *inode) 1510 { 1511 ihold(inode); 1512 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq, 1513 &ceph_inode(inode)->i_pg_inv_work)) { 1514 dout("ceph_queue_invalidate %p\n", inode); 1515 } else { 1516 dout("ceph_queue_invalidate %p failed\n", inode); 1517 iput(inode); 1518 } 1519 } 1520 1521 /* 1522 * Invalidate inode pages in a worker thread. (This can't be done 1523 * in the message handler context.) 1524 */ 1525 static void ceph_invalidate_work(struct work_struct *work) 1526 { 1527 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1528 i_pg_inv_work); 1529 struct inode *inode = &ci->vfs_inode; 1530 u32 orig_gen; 1531 int check = 0; 1532 1533 mutex_lock(&ci->i_truncate_mutex); 1534 spin_lock(&ci->i_ceph_lock); 1535 dout("invalidate_pages %p gen %d revoking %d\n", inode, 1536 ci->i_rdcache_gen, ci->i_rdcache_revoking); 1537 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { 1538 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE)) 1539 check = 1; 1540 spin_unlock(&ci->i_ceph_lock); 1541 mutex_unlock(&ci->i_truncate_mutex); 1542 goto out; 1543 } 1544 orig_gen = ci->i_rdcache_gen; 1545 spin_unlock(&ci->i_ceph_lock); 1546 1547 truncate_pagecache(inode, 0); 1548 1549 spin_lock(&ci->i_ceph_lock); 1550 if (orig_gen == ci->i_rdcache_gen && 1551 orig_gen == ci->i_rdcache_revoking) { 1552 dout("invalidate_pages %p gen %d successful\n", inode, 1553 ci->i_rdcache_gen); 1554 ci->i_rdcache_revoking--; 1555 check = 1; 1556 } else { 1557 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n", 1558 inode, orig_gen, ci->i_rdcache_gen, 1559 ci->i_rdcache_revoking); 1560 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE)) 1561 check = 1; 1562 } 1563 spin_unlock(&ci->i_ceph_lock); 1564 mutex_unlock(&ci->i_truncate_mutex); 1565 out: 1566 if (check) 1567 ceph_check_caps(ci, 0, NULL); 1568 iput(inode); 1569 } 1570 1571 1572 /* 1573 * called by trunc_wq; 1574 * 1575 * We also truncate in a separate thread as well. 1576 */ 1577 static void ceph_vmtruncate_work(struct work_struct *work) 1578 { 1579 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1580 i_vmtruncate_work); 1581 struct inode *inode = &ci->vfs_inode; 1582 1583 dout("vmtruncate_work %p\n", inode); 1584 __ceph_do_pending_vmtruncate(inode); 1585 iput(inode); 1586 } 1587 1588 /* 1589 * Queue an async vmtruncate. If we fail to queue work, we will handle 1590 * the truncation the next time we call __ceph_do_pending_vmtruncate. 1591 */ 1592 void ceph_queue_vmtruncate(struct inode *inode) 1593 { 1594 struct ceph_inode_info *ci = ceph_inode(inode); 1595 1596 ihold(inode); 1597 1598 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq, 1599 &ci->i_vmtruncate_work)) { 1600 dout("ceph_queue_vmtruncate %p\n", inode); 1601 } else { 1602 dout("ceph_queue_vmtruncate %p failed, pending=%d\n", 1603 inode, ci->i_truncate_pending); 1604 iput(inode); 1605 } 1606 } 1607 1608 /* 1609 * Make sure any pending truncation is applied before doing anything 1610 * that may depend on it. 1611 */ 1612 void __ceph_do_pending_vmtruncate(struct inode *inode) 1613 { 1614 struct ceph_inode_info *ci = ceph_inode(inode); 1615 u64 to; 1616 int wrbuffer_refs, finish = 0; 1617 1618 mutex_lock(&ci->i_truncate_mutex); 1619 retry: 1620 spin_lock(&ci->i_ceph_lock); 1621 if (ci->i_truncate_pending == 0) { 1622 dout("__do_pending_vmtruncate %p none pending\n", inode); 1623 spin_unlock(&ci->i_ceph_lock); 1624 mutex_unlock(&ci->i_truncate_mutex); 1625 return; 1626 } 1627 1628 /* 1629 * make sure any dirty snapped pages are flushed before we 1630 * possibly truncate them.. so write AND block! 1631 */ 1632 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) { 1633 dout("__do_pending_vmtruncate %p flushing snaps first\n", 1634 inode); 1635 spin_unlock(&ci->i_ceph_lock); 1636 filemap_write_and_wait_range(&inode->i_data, 0, 1637 inode->i_sb->s_maxbytes); 1638 goto retry; 1639 } 1640 1641 /* there should be no reader or writer */ 1642 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref); 1643 1644 to = ci->i_truncate_size; 1645 wrbuffer_refs = ci->i_wrbuffer_ref; 1646 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode, 1647 ci->i_truncate_pending, to); 1648 spin_unlock(&ci->i_ceph_lock); 1649 1650 truncate_pagecache(inode, to); 1651 1652 spin_lock(&ci->i_ceph_lock); 1653 if (to == ci->i_truncate_size) { 1654 ci->i_truncate_pending = 0; 1655 finish = 1; 1656 } 1657 spin_unlock(&ci->i_ceph_lock); 1658 if (!finish) 1659 goto retry; 1660 1661 mutex_unlock(&ci->i_truncate_mutex); 1662 1663 if (wrbuffer_refs == 0) 1664 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); 1665 1666 wake_up_all(&ci->i_cap_wq); 1667 } 1668 1669 /* 1670 * symlinks 1671 */ 1672 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd) 1673 { 1674 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode); 1675 nd_set_link(nd, ci->i_symlink); 1676 return NULL; 1677 } 1678 1679 static const struct inode_operations ceph_symlink_iops = { 1680 .readlink = generic_readlink, 1681 .follow_link = ceph_sym_follow_link, 1682 .setattr = ceph_setattr, 1683 .getattr = ceph_getattr, 1684 .setxattr = ceph_setxattr, 1685 .getxattr = ceph_getxattr, 1686 .listxattr = ceph_listxattr, 1687 .removexattr = ceph_removexattr, 1688 }; 1689 1690 /* 1691 * setattr 1692 */ 1693 int ceph_setattr(struct dentry *dentry, struct iattr *attr) 1694 { 1695 struct inode *inode = dentry->d_inode; 1696 struct ceph_inode_info *ci = ceph_inode(inode); 1697 const unsigned int ia_valid = attr->ia_valid; 1698 struct ceph_mds_request *req; 1699 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc; 1700 int issued; 1701 int release = 0, dirtied = 0; 1702 int mask = 0; 1703 int err = 0; 1704 int inode_dirty_flags = 0; 1705 1706 if (ceph_snap(inode) != CEPH_NOSNAP) 1707 return -EROFS; 1708 1709 err = inode_change_ok(inode, attr); 1710 if (err != 0) 1711 return err; 1712 1713 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR, 1714 USE_AUTH_MDS); 1715 if (IS_ERR(req)) 1716 return PTR_ERR(req); 1717 1718 spin_lock(&ci->i_ceph_lock); 1719 issued = __ceph_caps_issued(ci, NULL); 1720 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued)); 1721 1722 if (ia_valid & ATTR_UID) { 1723 dout("setattr %p uid %d -> %d\n", inode, 1724 from_kuid(&init_user_ns, inode->i_uid), 1725 from_kuid(&init_user_ns, attr->ia_uid)); 1726 if (issued & CEPH_CAP_AUTH_EXCL) { 1727 inode->i_uid = attr->ia_uid; 1728 dirtied |= CEPH_CAP_AUTH_EXCL; 1729 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1730 !uid_eq(attr->ia_uid, inode->i_uid)) { 1731 req->r_args.setattr.uid = cpu_to_le32( 1732 from_kuid(&init_user_ns, attr->ia_uid)); 1733 mask |= CEPH_SETATTR_UID; 1734 release |= CEPH_CAP_AUTH_SHARED; 1735 } 1736 } 1737 if (ia_valid & ATTR_GID) { 1738 dout("setattr %p gid %d -> %d\n", inode, 1739 from_kgid(&init_user_ns, inode->i_gid), 1740 from_kgid(&init_user_ns, attr->ia_gid)); 1741 if (issued & CEPH_CAP_AUTH_EXCL) { 1742 inode->i_gid = attr->ia_gid; 1743 dirtied |= CEPH_CAP_AUTH_EXCL; 1744 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1745 !gid_eq(attr->ia_gid, inode->i_gid)) { 1746 req->r_args.setattr.gid = cpu_to_le32( 1747 from_kgid(&init_user_ns, attr->ia_gid)); 1748 mask |= CEPH_SETATTR_GID; 1749 release |= CEPH_CAP_AUTH_SHARED; 1750 } 1751 } 1752 if (ia_valid & ATTR_MODE) { 1753 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode, 1754 attr->ia_mode); 1755 if (issued & CEPH_CAP_AUTH_EXCL) { 1756 inode->i_mode = attr->ia_mode; 1757 dirtied |= CEPH_CAP_AUTH_EXCL; 1758 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1759 attr->ia_mode != inode->i_mode) { 1760 inode->i_mode = attr->ia_mode; 1761 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode); 1762 mask |= CEPH_SETATTR_MODE; 1763 release |= CEPH_CAP_AUTH_SHARED; 1764 } 1765 } 1766 1767 if (ia_valid & ATTR_ATIME) { 1768 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode, 1769 inode->i_atime.tv_sec, inode->i_atime.tv_nsec, 1770 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec); 1771 if (issued & CEPH_CAP_FILE_EXCL) { 1772 ci->i_time_warp_seq++; 1773 inode->i_atime = attr->ia_atime; 1774 dirtied |= CEPH_CAP_FILE_EXCL; 1775 } else if ((issued & CEPH_CAP_FILE_WR) && 1776 timespec_compare(&inode->i_atime, 1777 &attr->ia_atime) < 0) { 1778 inode->i_atime = attr->ia_atime; 1779 dirtied |= CEPH_CAP_FILE_WR; 1780 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1781 !timespec_equal(&inode->i_atime, &attr->ia_atime)) { 1782 ceph_encode_timespec(&req->r_args.setattr.atime, 1783 &attr->ia_atime); 1784 mask |= CEPH_SETATTR_ATIME; 1785 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD | 1786 CEPH_CAP_FILE_WR; 1787 } 1788 } 1789 if (ia_valid & ATTR_MTIME) { 1790 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode, 1791 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 1792 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec); 1793 if (issued & CEPH_CAP_FILE_EXCL) { 1794 ci->i_time_warp_seq++; 1795 inode->i_mtime = attr->ia_mtime; 1796 dirtied |= CEPH_CAP_FILE_EXCL; 1797 } else if ((issued & CEPH_CAP_FILE_WR) && 1798 timespec_compare(&inode->i_mtime, 1799 &attr->ia_mtime) < 0) { 1800 inode->i_mtime = attr->ia_mtime; 1801 dirtied |= CEPH_CAP_FILE_WR; 1802 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1803 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) { 1804 ceph_encode_timespec(&req->r_args.setattr.mtime, 1805 &attr->ia_mtime); 1806 mask |= CEPH_SETATTR_MTIME; 1807 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1808 CEPH_CAP_FILE_WR; 1809 } 1810 } 1811 if (ia_valid & ATTR_SIZE) { 1812 dout("setattr %p size %lld -> %lld\n", inode, 1813 inode->i_size, attr->ia_size); 1814 if ((issued & CEPH_CAP_FILE_EXCL) && 1815 attr->ia_size > inode->i_size) { 1816 inode->i_size = attr->ia_size; 1817 inode->i_blocks = 1818 (attr->ia_size + (1 << 9) - 1) >> 9; 1819 inode->i_ctime = attr->ia_ctime; 1820 ci->i_reported_size = attr->ia_size; 1821 dirtied |= CEPH_CAP_FILE_EXCL; 1822 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1823 attr->ia_size != inode->i_size) { 1824 req->r_args.setattr.size = cpu_to_le64(attr->ia_size); 1825 req->r_args.setattr.old_size = 1826 cpu_to_le64(inode->i_size); 1827 mask |= CEPH_SETATTR_SIZE; 1828 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1829 CEPH_CAP_FILE_WR; 1830 } 1831 } 1832 1833 /* these do nothing */ 1834 if (ia_valid & ATTR_CTIME) { 1835 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME| 1836 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0; 1837 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode, 1838 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 1839 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec, 1840 only ? "ctime only" : "ignored"); 1841 inode->i_ctime = attr->ia_ctime; 1842 if (only) { 1843 /* 1844 * if kernel wants to dirty ctime but nothing else, 1845 * we need to choose a cap to dirty under, or do 1846 * a almost-no-op setattr 1847 */ 1848 if (issued & CEPH_CAP_AUTH_EXCL) 1849 dirtied |= CEPH_CAP_AUTH_EXCL; 1850 else if (issued & CEPH_CAP_FILE_EXCL) 1851 dirtied |= CEPH_CAP_FILE_EXCL; 1852 else if (issued & CEPH_CAP_XATTR_EXCL) 1853 dirtied |= CEPH_CAP_XATTR_EXCL; 1854 else 1855 mask |= CEPH_SETATTR_CTIME; 1856 } 1857 } 1858 if (ia_valid & ATTR_FILE) 1859 dout("setattr %p ATTR_FILE ... hrm!\n", inode); 1860 1861 if (dirtied) { 1862 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied); 1863 inode->i_ctime = CURRENT_TIME; 1864 } 1865 1866 release &= issued; 1867 spin_unlock(&ci->i_ceph_lock); 1868 1869 if (inode_dirty_flags) 1870 __mark_inode_dirty(inode, inode_dirty_flags); 1871 1872 if (ia_valid & ATTR_MODE) { 1873 err = posix_acl_chmod(inode, attr->ia_mode); 1874 if (err) 1875 goto out_put; 1876 } 1877 1878 if (mask) { 1879 req->r_inode = inode; 1880 ihold(inode); 1881 req->r_inode_drop = release; 1882 req->r_args.setattr.mask = cpu_to_le32(mask); 1883 req->r_num_caps = 1; 1884 err = ceph_mdsc_do_request(mdsc, NULL, req); 1885 } 1886 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err, 1887 ceph_cap_string(dirtied), mask); 1888 1889 ceph_mdsc_put_request(req); 1890 if (mask & CEPH_SETATTR_SIZE) 1891 __ceph_do_pending_vmtruncate(inode); 1892 return err; 1893 out_put: 1894 ceph_mdsc_put_request(req); 1895 return err; 1896 } 1897 1898 /* 1899 * Verify that we have a lease on the given mask. If not, 1900 * do a getattr against an mds. 1901 */ 1902 int ceph_do_getattr(struct inode *inode, int mask, bool force) 1903 { 1904 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); 1905 struct ceph_mds_client *mdsc = fsc->mdsc; 1906 struct ceph_mds_request *req; 1907 int err; 1908 1909 if (ceph_snap(inode) == CEPH_SNAPDIR) { 1910 dout("do_getattr inode %p SNAPDIR\n", inode); 1911 return 0; 1912 } 1913 1914 dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode); 1915 if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1)) 1916 return 0; 1917 1918 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 1919 if (IS_ERR(req)) 1920 return PTR_ERR(req); 1921 req->r_inode = inode; 1922 ihold(inode); 1923 req->r_num_caps = 1; 1924 req->r_args.getattr.mask = cpu_to_le32(mask); 1925 err = ceph_mdsc_do_request(mdsc, NULL, req); 1926 ceph_mdsc_put_request(req); 1927 dout("do_getattr result=%d\n", err); 1928 return err; 1929 } 1930 1931 1932 /* 1933 * Check inode permissions. We verify we have a valid value for 1934 * the AUTH cap, then call the generic handler. 1935 */ 1936 int ceph_permission(struct inode *inode, int mask) 1937 { 1938 int err; 1939 1940 if (mask & MAY_NOT_BLOCK) 1941 return -ECHILD; 1942 1943 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false); 1944 1945 if (!err) 1946 err = generic_permission(inode, mask); 1947 return err; 1948 } 1949 1950 /* 1951 * Get all attributes. Hopefully somedata we'll have a statlite() 1952 * and can limit the fields we require to be accurate. 1953 */ 1954 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 1955 struct kstat *stat) 1956 { 1957 struct inode *inode = dentry->d_inode; 1958 struct ceph_inode_info *ci = ceph_inode(inode); 1959 int err; 1960 1961 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false); 1962 if (!err) { 1963 generic_fillattr(inode, stat); 1964 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino); 1965 if (ceph_snap(inode) != CEPH_NOSNAP) 1966 stat->dev = ceph_snap(inode); 1967 else 1968 stat->dev = 0; 1969 if (S_ISDIR(inode->i_mode)) { 1970 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), 1971 RBYTES)) 1972 stat->size = ci->i_rbytes; 1973 else 1974 stat->size = ci->i_files + ci->i_subdirs; 1975 stat->blocks = 0; 1976 stat->blksize = 65536; 1977 } 1978 } 1979 return err; 1980 } 1981